Convert an RGB code to the corresponding CMYK code for printing.
The RGB input is a [1×3] double array between 0 and 1.
CMYK must be a [1×4] double array between 0 and 1.
Figurate number triangle
Narcissistic number ?
2倍してみよう - ここからスタート！
Wien's displacement law
Create an n-by-n null matrix and fill with ones certain positions
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